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Solar panel cost in Gwynedd (LL38)

See realistic solar installation costs, savings and payback for LL38 (Gwynedd) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
15.3 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£800
What you save every year
Profit Over 25 Years
£7,799
After paying itself off, you're this much ahead

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How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Costs: Battery prices are typically £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In North Wales and Mersey, the current unit rate is 24.43p/kWh with a 69.98p/day standing charge. Your postcode’s south-facing sunshine yield is 846 kWh/kW — 84 below the regional median (930).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 846 kWh per year on a south-facing roof. We value self-used electricity at 24.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
24.4p/kWh
Standing charge
70.0p/day
Sunshine yield (south)
846 kWh/kW
Export price (baseline)
10p/kWh

Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.

No battery 5 kW example → Annual benefit: £667, Upfront: £10,173, Break-even: 15.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 677 kWh 1015 kWh £165 £101 £267 £4,069 15.3 yrs £1,266
3 kW 2537 kWh 1015 kWh 1522 kWh £248 £152 £400 £6,104 15.3 yrs £1,899
4 kW 3383 kWh 1353 kWh 2030 kWh £331 £203 £533 £8,138 15.3 yrs £2,532
5 kW 4228 kWh 1691 kWh 2537 kWh £413 £254 £667 £10,173 15.3 yrs £3,165
6 kW 5074 kWh 2030 kWh 3044 kWh £496 £304 £800 £12,207 15.3 yrs £3,798
7 kW 5919 kWh 2368 kWh 3552 kWh £578 £355 £934 £14,242 15.3 yrs £4,431
8 kW 6765 kWh 2706 kWh 4059 kWh £661 £406 £1,067 £16,276 15.3 yrs £5,064

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £789, Upfront: £12,273, Break-even: 15.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1015 kWh 677 kWh £248 £68 £316 £6,169 19.5 yrs £142
3 kW 2537 kWh 1522 kWh 1015 kWh £372 £101 £473 £8,204 17.3 yrs £1,263
4 kW 3383 kWh 2030 kWh 1353 kWh £496 £135 £631 £10,238 16.2 yrs £2,384
5 kW 4228 kWh 2537 kWh 1691 kWh £620 £169 £789 £12,273 15.6 yrs £3,505
6 kW 5074 kWh 3044 kWh 2030 kWh £744 £203 £947 £14,307 15.1 yrs £4,626
7 kW 5919 kWh 3552 kWh 2368 kWh £868 £237 £1,104 £16,342 14.8 yrs £5,747
8 kW 6765 kWh 4059 kWh 2706 kWh £992 £271 £1,262 £18,376 14.6 yrs £6,868

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £850, Upfront: £13,673, Break-even: 16.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1184 kWh 507 kWh £289 £51 £340 £7,569 22.3 yrs £-770
3 kW 2537 kWh 1776 kWh 761 kWh £434 £76 £510 £9,604 18.8 yrs £595
4 kW 3383 kWh 2368 kWh 1015 kWh £578 £101 £680 £11,638 17.1 yrs £1,960
5 kW 4228 kWh 2960 kWh 1268 kWh £723 £127 £850 £13,673 16.1 yrs £3,325
6 kW 5074 kWh 3552 kWh 1522 kWh £868 £152 £1,020 £15,707 15.4 yrs £4,691
7 kW 5919 kWh 4144 kWh 1776 kWh £1,012 £178 £1,190 £17,742 14.9 yrs £6,056
8 kW 6765 kWh 4736 kWh 2030 kWh £1,157 £203 £1,360 £19,776 14.5 yrs £7,421

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £868, Upfront: £15,423, Break-even: 17.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1235 kWh 457 kWh £302 £46 £347 £9,319 26.8 yrs £-2,373
3 kW 2537 kWh 1852 kWh 685 kWh £452 £68 £521 £11,354 21.8 yrs £-935
4 kW 3383 kWh 2469 kWh 913 kWh £603 £91 £695 £13,388 19.3 yrs £503
5 kW 4228 kWh 3087 kWh 1142 kWh £754 £114 £868 £15,423 17.8 yrs £1,942
6 kW 5074 kWh 3704 kWh 1370 kWh £905 £137 £1,042 £17,457 16.8 yrs £3,380
7 kW 5919 kWh 4321 kWh 1598 kWh £1,056 £160 £1,215 £19,492 16.0 yrs £4,818
8 kW 6765 kWh 4938 kWh 1827 kWh £1,206 £183 £1,389 £21,526 15.5 yrs £6,256

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £880, Upfront: £17,173, Break-even: 19.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1268 kWh 423 kWh £310 £42 £352 £11,069 31.4 yrs £-4,026
3 kW 2537 kWh 1903 kWh 634 kWh £465 £63 £528 £13,104 24.8 yrs £-2,539
4 kW 3383 kWh 2537 kWh 846 kWh £620 £85 £704 £15,138 21.5 yrs £-1,052
5 kW 4228 kWh 3171 kWh 1057 kWh £775 £106 £880 £17,173 19.5 yrs £436
6 kW 5074 kWh 3805 kWh 1268 kWh £930 £127 £1,056 £19,207 18.2 yrs £1,923
7 kW 5919 kWh 4440 kWh 1480 kWh £1,085 £148 £1,233 £21,242 17.2 yrs £3,410
8 kW 6765 kWh 5074 kWh 1691 kWh £1,240 £169 £1,409 £23,276 16.5 yrs £4,897

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £893, Upfront: £19,623, Break-even: 22.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1691 kWh 1302 kWh 389 kWh £318 £39 £357 £13,519 37.9 yrs £-6,378
3 kW 2537 kWh 1953 kWh 583 kWh £477 £58 £536 £15,554 29.0 yrs £-4,842
4 kW 3383 kWh 2605 kWh 778 kWh £636 £78 £714 £17,588 24.6 yrs £-3,306
5 kW 4228 kWh 3256 kWh 972 kWh £795 £97 £893 £19,623 22.0 yrs £-1,770
6 kW 5074 kWh 3907 kWh 1167 kWh £954 £117 £1,071 £21,657 20.2 yrs £-234
7 kW 5919 kWh 4558 kWh 1361 kWh £1,114 £136 £1,250 £23,692 19.0 yrs £1,301
8 kW 6765 kWh 5209 kWh 1556 kWh £1,273 £156 £1,428 £25,726 18.0 yrs £2,837

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.

Insights for LL38

Figures below are tailored to LL38 — click through for full league tables.

Big-Roof Britain Rank #322 of 2182
5.9 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #2514 of 2997
13.6 years (UK avg 12.6 years)
~£895 /yr • £12,207 upfront
Standing-Charge Drag Rank #2348 of 2997
29.0% (UK avg 24.6%) drag on savings
£259 fixed • ~£895 /yr value
Aspect Penalty View ranking →
East −16.6% West −20.9%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in LL38

Monthly generation per kilowatt of solar panels

kWh 25 Jan 42 Feb 75 Mar 105 Apr 114 May 111 Jun 107 Jul 93 Aug 76 Sep 49 Oct 31 Nov 19 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 40.4% of an average month (Dec–Feb)

Best / worst month: May / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 28 kWh per month; the average month produces around 70 kWh. So a typical 4 kW home system would generate roughly 114 kWh in winter, or 282 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
24.43p/kWh
Daily Fixed Charge
69.98p/day
Local Sunshine
846kWh/kW
A 1 kW system generates ~846 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 29% • Flats: 6% • Bungalows: 65% Based on 292 properties

Coverage

Gwynedd (100%)

Areas Covered

Arthog a Llangelynnin, De Dolgellau

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q1 2026

Installation costs: MCS certified installer data, March 2025

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in North Wales and Mersey

LL39 (Gwynedd)
≈3.1 km away
Local sunshine: ~825 kWh/kWp · -2% vs LL38
LL42 (Gwynedd)
≈3.1 km away
Local sunshine: ~864 kWh/kWp · +2% vs LL38
LL37 (Gwynedd)
≈4.0 km away
Local sunshine: ~878 kWh/kWp · +4% vs LL38
LL43 (Gwynedd)
≈9.2 km away
Local sunshine: ~875 kWh/kWp · +3% vs LL38
LL44 (Gwynedd)
≈10.8 km away
Local sunshine: ~875 kWh/kWp · +3% vs LL38
LL36 (Gwynedd)
≈12.2 km away
Local sunshine: ~940 kWh/kWp · +11% vs LL38

Similar sunshine across the UK

BB8 (Pendle)
~846 kWh/kWp · -0% vs LL38
PA8 (Renfrewshire)
~846 kWh/kWp · -0% vs LL38
BT49 (Causeway Coast and Glens)
~846 kWh/kWp · +0% vs LL38